CN205591264U - Sediment detection device at bottom of stake of drilling bored concrete pile - Google Patents

Abstract

The utility model relates to a sediment detection device at the bottom of a bored pile, which comprises a cantilever, a detection box, a probe and a hydraulic cylinder. The detection box is arranged at the end of the cantilever, the hydraulic cylinder is arranged in the detection box, and the probe is arranged outside the piston. On the end face, the probe is parallel to the axis of the piston. The utility model has the advantages of simple structure, small volume, high precision, convenient detection and easy portability.

Description

A Bottom Sediment Detection Device for Bored Pile

technical field

The utility model relates to the technical field of detection, in particular to a detection device for sediment at the bottom of bored piles.

Background technique

Pile bottom sediment is an important factor affecting the bearing capacity of pile foundation. Too thick sediment will produce a "soft cushion" effect, thereby reducing the bearing capacity of the pile and increasing the settlement of the pile body. Studies have shown that when the thickness of sediment increases and the strength weakens, the maximum loss of pile tip resistance can reach more than 80%, and the thicker the sediment, the greater the loss of pile foundation bearing capacity. Bottom sediment thickness of bored piles is an important indicator of hole quality, and its control and measurement measures are one of the key measures to ensure the construction quality of bored piles and the bearing capacity of pile foundations. Therefore, the corresponding current national standards and norms have clear requirements for sediment thickness control. When the pile is dominated by friction, the allowable thickness of the sediment shall not be greater than 100mm, and when the pile is mainly end-bearing, it shall not be greater than 50mm; for end-bearing piles, the thickness of the sediment at the bottom of the hole shall not exceed 50mm. For friction piles, it is not more than 150mm. The existing sediment thickness detection method is mainly the "weight hammer method", which mainly relies on the engineer's hand feeling and experience to judge the sediment thickness, and the detection accuracy is difficult to guarantee.

Utility model content

Aiming at the deficiency of the existing sediment detection technology, the utility model proposes a sediment thickness detection tool and detection method for bored cast-in-situ piles, which can accurately measure the thickness of the sediment at the bottom of the pile hole.

In order to achieve the above object, the technical scheme adopted by the utility model is as follows:

A device for detecting sediment at the bottom of a bored pile, comprising a cantilever, a detection box, a probe and a hydraulic cylinder, the detection box is set at the end of the cantilever, the hydraulic cylinder is set in the detection box, and the probe is set in the piston On the outer end face of the piston, the probe is parallel to the axis of the piston. .

Further, a controller is also included, and the hydraulic cylinder is electrically connected with the controller.

Further, the controller includes a display screen, a micro camera is arranged on the side of the detection box, the micro camera is on the same level as the bottom surface of the detection box, and the micro camera is electrically connected to the controller.

Further, the front end of the probe is provided with a pressure sensor, and the pressure sensor is electrically connected with the controller.

Further, the piston or the probe is provided with a displacement sensor, and the displacement sensor is electrically connected with the controller.

Further, the cantilever is retractable.

Further, a spring is provided in the hydraulic cylinder, one end of the spring is connected to the piston, and the other end of the spring is connected to the cylinder, the spring is arranged in parallel with the probe, and the spring is a linear spring.

Further, the top of the cantilever is connected with the steel strands of the trolley. Further, the spring is arranged at the lower end of the cylinder.

Compared with the prior art, the utility model has the following beneficial effects:

The utility model has the advantages of simple structure, small volume, high precision, convenient detection, easy portability and the like.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a schematic structural view of the probe box when the probe is not stretched out in Example 2;

Fig. 3 is the structural representation of probe box when probe stretches out in embodiment 2;

Fig. 4 is a schematic structural view of the probe box when the probe is not stretched out in Example 4;

Fig. 5 is a schematic structural view of the probe box when the probe is stretched out in embodiment 4;

In the figure: 1-truck, 2-cantilever, 3-detection box, 4-probe, 5-miniature camera, 6-controller, 7-piston, 8-cylinder, 9-spring.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings.

Example 1

As shown in Figure 1, the bottom sediment detection device for bored piles disclosed in this embodiment includes a cantilever 2, a detection box 3, a probe 4 and a hydraulic cylinder, the detection box 3 is located at the end of the cantilever 2, and the hydraulic cylinder is located at the detection In the box 3 , the probe 4 is arranged on the outer end surface of the piston 7 , and the probe 4 is parallel to the axis of the piston 7 . Preferably, when the hydraulic cylinder is not working, the probe 4 is also located in the detection box 3, and when the hydraulic cylinder starts to work, the probe 4 is moved out of the detection box. Further, the detection device also includes a controller 6 , and the hydraulic cylinder is electrically connected to the controller 6 . Preferably, a displacement sensor is provided on the piston 7 or the probe 4, and the displacement sensor is electrically connected with the controller 6, and the displacement of the probe 4, that is, the depth of the sediment, is known through the displacement sensor.

Further, the cantilever 2 is telescopic, preferably, the cantilever 2 is a four-stage telescopic arm; the cantilever 2 can also be a telescopic hydraulic cylinder, and further, the top of the cantilever 2 is connected with the steel strand of the trolley 1, and the steel strand It is connected with the hook on the driving car, and the detection device moves with the frame car 1. Frame car 1 can choose winch.

When in use, after the hole digging and slag removal work is completed, the utility model device is moved to the orifice by driving 1, and the cantilever 2 is lowered slowly. When the bottom end of the probe 4 reaches the surface of the sediment, stop lowering the cantilever 2, and the hydraulic cylinder starts to work. The hydraulic cylinder drives the piston 7 to move downward with a constant force, and the probe 4 moves downward with the piston 7. When the probe 4 reaches the bottom of the hole, the piston 7 stops moving because the force at the bottom of the hole is greater than the thrust of the piston 7 of the hydraulic cylinder. , read the displacement of the probe, this displacement is the depth of the sediment. The displacement of the probe can be read by setting a scale on the probe, and the distance can also be measured by an ultrasonic device.

Example 2

As shown in Figures 3 and 4, the difference between this embodiment and Embodiment 1 is that the controller 6 includes a display screen, and the side of the detection box 3 is provided with a miniature camera 5, and the miniature camera 5 and the bottom surface of the detection box 3 are on the same horizontal plane. The camera 5 is electrically connected with the controller 6 . The display screen can display the picture seen by the micro-camera to judge whether the front end of the device has reached the sediment surface. In use and reading the probe drop depth.

When in use, after the hole digging and slag removal work is completed, the utility model device is moved to the orifice by driving 1, and the cantilever 2 is lowered slowly, and observed through the display screen, when the bottom end of the probe 4 reaches the surface of the sediment, stop lowering the cantilever 2, The hydraulic cylinder starts to work, and the hydraulic cylinder drives the piston 7 to move downward with a constant force, and the probe 4 moves downward with the piston 7. When the probe 4 reaches the bottom of the hole, the force at the bottom of the hole is greater than the thrust of the piston 7 of the hydraulic cylinder. , the piston 7 stops moving, and the displacement sensor measures the displacement of the probe, which is the depth of the sediment.

Example 3

The difference between this embodiment and embodiment 1 or 2 is that: the front end of the probe 4 is provided with a pressure sensor, and the pressure sensor is electrically connected with the controller 6 .

When in use, after the hole digging and slag removal work is completed, the utility model device is moved to the orifice by driving 1, and the cantilever 2 is slowly put down, the hydraulic cylinder starts to work, and the hydraulic cylinder drives the piston 7 to move downward with a constant force, and the probe 4 follows Piston 7 moves downward, and the sensing value of the pressure sensor is 0 at this time. When the sensing value of the pressure sensor is 0, it means that the probe has contacted the sediment, and this time is used as the displacement zero point; when the sensing value of the pressure sensor reaches the set value, Probe 4 reaches the bottom of the hole, the hydraulic cylinder stops working, and the displacement sensor measures the displacement of the probe, which is the depth of the sediment.

Example 4

As shown in Figures 4 and 5, the difference between this embodiment and Embodiment 1, 2 or 3 is that a spring 9 is arranged in the hydraulic cylinder, one end of the spring 9 is connected with the piston 7, the other end of the spring 9 is connected with the cylinder body 8, and the spring 9 9 is arranged parallel to the probe 4, and the spring 9 is a linear spring. Further, the spring 9 is arranged at the lower end of the cylinder body 8 . Because the hydraulic cylinder is vertically downward, the piston 7 has a certain gravity, and the spring 9 can apply elastic force to the piston 7 to balance the gravity of the piston 7. Of course, other ways can be used to resist the gravity of the piston 7, such as the friction between the piston 7 and the cylinder 8 is equivalent to the gravity of the piston 7. Since the spring 9 is a linear spring, during the downward movement of the piston 7, the elastic force of the spring 9 can be calculated through the deformation of the spring 9, and then the force applied by the hydraulic cylinder to the probe can be known. When the probe 4 reaches At the bottom of the hole, because the force at the bottom of the hole is greater than the thrust of the piston 7, the piston 7 stops moving and reads the displacement of the probe, which is the depth of the sediment; or when the force reaches the set value, stop pumping oil, The displacement of the probe 4 is read, and the piston 7 resets under the action of the spring 9 .

The utility model has the advantages of simple structure, small volume, high precision, convenient detection, easy portability and the like.

Certainly, the utility model also can have other multiple implementation modes, under the situation of not departing from the spirit and essence of the utility model, those skilled in the art can make various corresponding changes and distortions according to the utility model, but these Corresponding changes and deformations should all belong to the scope of protection of the appended claims of the utility model.

Claims (9)

1. a bored pile bottom sediment detection device, is characterized in that: comprise cantilever (2), detection box (3), probe (4) and hydraulic cylinder, described detection box (3) is located at cantilever ( 2) At the end, the hydraulic cylinder is arranged in the detection box (3), the probe (4) is arranged on the outer end surface of the piston (7), and the probe (4) is parallel to the axis of the piston (7). 2. The device for detecting sediment at the bottom of bored piles according to claim 1, characterized in that it further comprises a controller (6), and the hydraulic cylinder is electrically connected to the controller (6). 3. The device for detecting sediment at the bottom of bored piles according to claim 2, characterized in that: the controller (6) includes a display screen, and a miniature camera (5) is arranged on the side of the detection box (3), The miniature camera (5) is on the same level as the bottom surface of the detection box (3), and the miniature camera (5) is electrically connected with the controller (6). 4. The device for detecting sediment at the bottom of bored piles according to claim 2, characterized in that: the front end of the probe (4) is provided with a pressure sensor, and the pressure sensor is electrically connected to the controller (6). 5. The device for detecting sediment at the bottom of bored piles according to claim 3 or 4, characterized in that: the piston or the probe (4) is provided with a displacement sensor, and the displacement sensor and the controller (6) electrical connection. 6. The device for detecting sediment at the bottom of bored piles according to claim 1, characterized in that: the cantilever (2) is telescopic. 7. The device for detecting sediment at the bottom of bored piles according to claim 1, characterized in that: a spring (9) is arranged in the hydraulic cylinder, one end of the spring (9) is connected to the piston (7), and the spring (9) The other end is connected to the cylinder body (8), the spring (9) is arranged in parallel with the probe (4), and the spring (9) is a linear spring. 8. The device for detecting sediment at the bottom of a bored pile according to claim 1, characterized in that: the top of the cantilever (2) is connected to the steel strand of the trolley (1). 9. The device for detecting sediment at the bottom of bored piles according to claim 7, characterized in that: the spring (9) is arranged at the lower end of the cylinder (8).